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2 µm lasing from Tm3+-doped PbO-PbF2-Bi2O3-Ga2O3 glass microspheres

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Abstract

Whispering gallery mode (WGM) lasers at ${\sim}{2}\;\unicode{x00B5}{\rm m}$ are demonstrated in PbO-${{\rm PbF}_{2}} {\text -} {{\rm Bi}_{2}}{\rm O}_3 {\text -} {{\rm Ga}_{2}}{\rm O}_3$ (PBG) heavy metal oxyfluoride glass microspheres. A 793 nm diode laser is used to pump the PBG microsphere and achieve single-mode and multimode WGM lasing. The fluorescence spectra of ${{\rm Tm}^{3 +}}$-doped PBG glasses are measured under 793 nm diode laser pumping. The maximum absorption and emission cross sections of ${{\rm Tm}^{3 +}}{:}^{3}{\rm F}_4{\to ^3}{\rm H}_6$ are calculated to be ${8.23} \times {{10}^{- 21}}$ and ${4.42} \times {{10}^{- 20}}\;{\rm cm}^2$, respectively. The experimental results indicate that these PBG glass microspheres could become an important photonic component for infrared laser applications.

© 2021 Optical Society of America

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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